An (almost) identity stylesheet

Hi list,

I am a novice to XSLT, learned mainly form online tutorials. This XSLT
thing is killing me. Can't figure out how to transform my doc.xml:

<?xml version="1.0" encoding="UTF-8"?>
<foo>
    <bar>
        <date attrib1='aaaaaaa' attrib2='bbbbbb'>25-02-08</date>
                                         ^
        <name attrib3='null'>AAAAAAAAAAAAAAA</name>
    </bar>
    <bar>
        <date attrib1='cccccc' attrib2='dddddd'>26-02-08</date>
                                        ^
        <name attrib4='null'>BBBBBBBBBBBBBBB</name>
    </bar>
</foo>


into


<?xml version="1.0" encoding="UTF-8"?>
<foo>
    <bar>
        <date attrib1='aaaaaaa' attrib2='0'>25-02-08</date>
                                         ^
        <name attrib3='null'>AAAAAAAAAAAAAAA</name>
    </bar>
    <bar>
        <date attrib1='cccccc' attrib2='0'>26-02-08</date>
                                        ^
        <name attrib4='null'>BBBBBBBBBBBBBBB</name>
    </bar>
</foo>

Can somebody please suggest the correct stylesheet?

I am blindly typing mainly 'copy' or 'copy-of' in my templates and the
output generation mechanics make little sense to me. The docs, comparing
to other programing documentation seems hard to understand. Could
somebody suggest good docs, please?

Regards,
Karol